linux-kernel - Re: raid is dangerous but that's secret (was Re: [patch] ext2/3: document conditions when reliable operation is possible)

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Message-ID: <20090902205558.GB2398@elf.ucw.cz>
Date:	Wed, 2 Sep 2009 22:55:58 +0200
From:	Pavel Machek <pavel@....cz>
To:	Christian Kujau <lists@...dbynature.de>
Cc:	Theodore Tso <tytso@....edu>, NeilBrown <neilb@...e.de>,
	Ric Wheeler <rwheeler@...hat.com>,
	Rob Landley <rob@...dley.net>, Florian Weimer <fweimer@....de>,
	Goswin von Brederlow <goswin-v-b@....de>,
	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, mtk.manpages@...il.com,
	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-ext4@...r.kernel.org, corbet@....net
Subject: Re: raid is dangerous but that's secret (was Re: [patch] ext2/3:
	document conditions when reliable operation is possible)

On Sun 2009-08-30 02:01:10, Christian Kujau wrote:
> On Sun, 30 Aug 2009 at 09:51, Pavel Machek wrote:
> > > give system administrators.  It's better than the fear-mongering
> > > patches you had proposed earlier, but what would be better *still* is
> > > telling people why running with degraded RAID arrays is bad, and to
> > > give them further tips about how to use RAID arrays safely.
> > 
> > Maybe this belongs to Doc*/filesystems, and more detailed RAID
> > description should go to md description?
> 
> Why should this be placed in *kernel* documentation anyway? The "dangers 
> of RAID", the hints that "backups are a good idea" - isn't that something 
> for howtos for sysadmins? No end-user will ever look into

The fact that two kernel subsystems (MD RAID, journaling filesystems)
do not work well together is surprising and should be documented near
the source.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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